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(No Model.)

W. D. OROUTT. ROTARY GUTTER.

No. 283,808. Patented Aug. 28, 1833.

5 1% mm ,WJ w #m CIE UNITED STATES- yPirrnNT Fries.

WILLIAMD. OROUTT, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALE T@JAMES H. BUSELL, OF SAME PLACE.

ROTARY CUTTER.

SPECIFICATION forming part of Letters Patent No. 283,808, dated August28, 1883. Application filed January 11, 188.3. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM D. Oncurr, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Rotary Cutters, of which the following, taken inconnection with the accompanying drawings, is a speciiication.

My invention relates to that class of rotary cutters for trimming theedges of boot and shoe soles in which a series of cutting-blades areused, arranged about a common hub or axis and molded upon theirperipheral surfaces, so as to cut a molded edge upon the boot or shoesole, and adapted to be sharpened by grinding their front radial ornearly radial faces; and it consists, first, in the combination of acentral hub provided with a series of radial or tangential armsprojecting therefrom at regular distances, each having formed in itsperipheral end a dovetailed circumferential groove, the bottom of whichis eccentric to the axis of said hub, said arms being divided into twoparts by a circumferential slit, a series of segmental cutter-bladesfitted in said dovetailed grooves, one upon each arm of said hub,

Vand having their outer or circumferential surfaces molded to thereverse of the shape that it is desired to impart to the boot or shoesole to be trimmed, and their front or cutting ends in the form ofplanes radial or nearly radial to the axis of the hub, and acorresponding series of clampingscrews arranged in said arms and adaptedto nip said divided arms upon the cutters to hold them in the desiredposition thereon.

lt further consists in the combination of a cutter-head composed of acentral hub and a series of bifurcated arms, each having formed in itsperipheral enda dovetailed groove ec centric to the axis of said hub, aseries of moldedsegmental cutter-blades fitted to and adapted to beadjusted endwise in said dovetailed grooves and clamped securely in anydesired position therein, and a rand-guard disk having an annular lipprojecting laterally from its thin outer edge and adapted to overhang aportion of each of said segmental cut` ter-blades and serve as a gage todetermine the 5o location of said segmental cutter-blades, to insurecorrespondence of the cutting-edges of said cutters-br, in other words,to enable the said cutters to be removed and ground upon their frontradial faces and then replaced and so set that their cutting-edges shallall be equidistant from the axis of the cutter-head, regardless ofwhether the same amount was ground from each cutter or not.

It is very essential to the performance of good work in trimming bootand shoe soles or heels with rotary cutters that -a considerable numberof cutting-blades should be used, arranged equidistant from each otheraround the periphery of the cutter-head, and that the severalcutting-edges should` be equidistant from the axis of the head and theirouter or peripheral surfaces should be slightly eccentric to the axis ofmotion about which they revolve. Many expedient-s and changes in theconstruction and mode of using rotary cutters for such purposes havebeen resorted to in order to realize the above-named conditions, butwith more or less indifferent success. The best result, so far as myknowledge extends, has been attained by the use of a cutter composed ofa series of cutting-blades arranged around and made in one piece with acommon central hub, the outer or peripheral ends of which blades werefirst turned concentric with the axis of the cutter, and then had thenecessary backing off or clearance7 given thereto by bending each bladebackward a given distance, or by cutting away a portion of the stockfrom the cutting corner backward, so as to make the outer surfaces ofsaid blades eccentric to their axis of revolution in an equal degree,said cutters being sharpened by grinding their front radial or nearlyradial faces.V A careful examination of the subject, however, will showthat in order to keep the most perfect cutter of the kind just describedin good working condition great care must be taken to grind all theblades precisely alike and to an equal amount. This is a very difficultthing to accomplish, and necessarily an expensive one; and, besides, ifan accident happens to break one of the blades, the cutter is spoiledand has to be thrown away and a new one substituted therefor; forjfwhenthe blades become so worn as to be unserviceable,

IOO

the whole cutter, hub and all, is thrown away.

To obviate these objections is the object ofV my present invention.

Figure 1 of the drawings is an edge elevation of a cutter embodying myinvention. Fig.

of the segmental cutters and an elevation of the side of the sameopposite to that shown in Fig. 2.

A is the cutterhead, composed of the central hub, a, and a series ofradiating or tangential arms, a, which are divided by thecircumferential slity or thin groove a2 into two unequal parts, as shownin Fig. 3, each arm being provided with a binding-screw, b, which passesfreely through the thin portion and is screwed into the thick portion ofsaid arm, the head of said screw bearing upon the thin part of the arm,as shown, whereby the thin portion of said arm may be moved slightlytoward the thick portion to clamp the cutter, said thin portion of thearmspringing at the point where it joins its hub a, it being weakened atthat point by cutting across it the groove c. (Shown in Figs. 2 and 3.)This cutter-head A is made byflrst turning a disk of metal to thedesired diameter and forming in its periphery a shallow dovetailedgroove extending circumferentially around the same, cutting longitudinalslits through the same at stated and equal distances, to form the armsa', then shaping the ends of said arms to give the necessary clearance,in any of the wellknown ways, and then dividing said arms into two partsby cutting the circumferential slit a2, the binding-screws b beingfitted thereto at any desired time inthe progress of the work in awell-known manner. A segmental cutter, d, curved to fit the peripheralcurve of the arm c', and having its outer surface molded to the desiredshape, and having formed upon its inner portion a male dovetailto fitthe dovetail grooves in the ends of said arms, is securely clamped toeach of said arms by means of the clamping-screws b and the pressureofthe dovetail lips e' andl e, which formthe walls of the dovetailgrooves in said arms, said cutters being adapted to be adjusted endwisein said grooves, moving in a path eccentric to the axis of thecutter-head. The cutters d d are made -by first turning a ring of steelto the desired The cutter-head A is tted tightly upon the shaft B, andis clamped thereto by the randguard disk C and the bolt C', screwed intothe end of the 'shaft B, as shown in Fig. 3. The rand-guard disk C hasformed upon its inner face a short central hub, f, to enter the hole inr .the cutterhead A to center it thereon, and at its outer edge theinwardly-projecting annular lip g, which overhangs a portion of one edgeof each of the cutters d d, and serves as a gage to set said cutters bywhen new, or after each grinding of said cutters.

It is obvious that as the inner shoulder of the lip g is concentricwith`the axis of the cutter-head, and the surfaces upon which theseveral cutters d d rest or have their bearings are eccentric to saidaxis, and said cutters, when adjustedmust be moved in paths eccentric tothe axis of said cutter-head, it follows that when said cutters are allset upon their several supporting-arms with those portions of theircutting corners which are in the same radial planeas said lip g are incontact therewith their cutting corners are all equidistant from theaxis of the cutter-head, and consequently move in the same circular pathwhen the cutter is revolved.

It will also be obvious that if in grinding said cutters more is ground.from one cutter than another, it will not injure the practical workingof the instrument, as each cutter-blade may be readily adjusted to itsproper position and distance from the axis of the cutter-head. Therand-guard eectually prevents the cutter-blades from injuring theupper77 by virtue of the fact that its thin outer edge is insertedbetween the upper and the projecting edge of the sole, and being largerin diameter than the circle described by those portions of thecutting-blades which are nearest to the upper, it is impossible for thecutting-blades to come in contact with the upper to do it injury.

Another advantage of this construction of rotary cutters is thatcutting-blades adapted to form molded edges of different shapes uponboot or shoe soles may be used upon the same cutter-head, and when thecutter-blades are worn out another set may be applied to the saine head,or, in other words, only thelblades IOO IIO

have to be renewed, whereas in the case ofthe cutter in which the bladesare made in one I am aware that it is not new to make the one piecetherewith, and each provided with rgo 5 ries of cutting blades or toolshaving their outer surfaces molded to a uniform pattern, and adapted tobe sharpened by grinding their front radial or nearly radial faces, andiitted one to the dovetailed eccentric groove in each Io of the arms a',and means of clamping them y therein, substantially as described.

2. The cutter-head A, composed of the hub a and a series of arms, a',made in one piece therewith, and cach provided with a circumferentialslit, c2, and having their outer surfaces eccentric to their axis ofrevolution, and provided with dovetailed grooves in their peripheralends, and with the grooves c at their bases, as set forth, incombination with a series of molded cutting-tools, d d, iitted to saiddovetailed grooves, and the clamping-screws b b, all arranged andadapted to operate substantially as and for the purposes described.

3. In combination With a rotary cutter-head having a series ofadjustable cutting-tools adapted to be sharpened by grinding their frontradial faces, the rand-guard disk IO, provided with theinwardly-projecting annular lip g, to serve as a gage for setting theadjustable cutting-tools, all arranged and adapted to operatesubstantially as and for the purposes described.

4. The combination of the cutter-head A, composed of a central hub, a,and afscries of arms, a', each provided With a circumferential slit, a2,and having on its outer or peripheral end an eccentric groove, a seriesof molded cutting-tools,cl emitted one to each of said dovetailedeccentric grooves, means of clamping said cutting-tools in positionsupon said arms, and the rand-guard disk C, provided with the gage-lip g,all arranged and adapted to operate substantially as and for thepurposes described.

In testimony whereof I have signed my name to this speciiication, in thepresence of two subscribing Witnesses, on this 9th day of January,

WILLIAM D. ORCUTT. Witnesses: E. A. HEMMENWAY, VALTER E. LOMBARD.

